note: the video header states this was a Black Lives Matter-DC march. The march was organized by the Stop Police Terror Project and Black Lives Matter-DC was a participant.
On the 22nd of October, the National Day of Protest Against Police Brutality, the Stop Police Terror Project and Black Lives Matter-DC marched against Mayor Bowser's "Resume Raiser" event hoping to catch her there, and then against the brand-new National Law Enforcement Museum. Mayor Bowser scuttled out the back door and escaped from her own event as Black Lives Matter spoke in front of the front door.
At one point during the march between these two targets, marchers chanted "Cops and the Klan work hand in hand!" The white power T-shirts worn by MPD's "gun recovery unit" in wards 7 and 8 are one piece of evidence of this. Another is the close cooperation between MPD, prosecutors, and the alt-right in their failed attempt to railroad J20 (inauguration) protesters into prison for over 80 years each. That prosecution fell apart after prosecutors were caught using deceptively edited video from Project Veritas and not turning over to defense attorneys exculpatory evidence that had been edited out.
The most important proof that the police and the Klan work hand in hand, however, is the role they play in gentrification and displacement. When developers want to build condos in an African-American neighborhood, the first thing that happens is Muriel Bowser floods the area with cops. Jump-outs and wholesale harassment follow and police do not hesistate to kill when Black people dare to resist or even just try to escape. This of course is just MPD following in the footsteps of the slavecatchers from whom police departments in the US evolved.